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Wave hydrodynamics around a multi-functional artificial reef at Leirosa

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Abstract

This paper describes an application of the Boussinesq-type COULWAVE model to study the wave hydrodynamics in the vicinity of a multi-functional artificial reef (MFAR). This reef is under investigation and consists of a supplementary protection solution for the Leirosa sand dune system located at South of Figueira da Foz, on the Portuguese West coast. Such installation near the coastline is expected to contribute to enhance the surfing conditions in the area, protect the sand dune system in the surroundings of Leirosa beach, and increase its environmental value. Numerical calculations with the COULWAVE model were performed for four test cases, considering two reef geometries (differing in the reef angle) and two incident wave conditions (storm condition and a common wave condition). Comparisons between the results obtained, in terms of wave heights and breaking line positions allow us to assess the influence of the reef on the hydrodynamics near the beach and around the reef. Moreover, the reef performance was analysed in terms of surfability and coastal protection. The surfability parameters (breaker height, Iribarren number and peel angle) were calculated for each test case using the numerical wave heights, wave directions and wave breaking positions. Comparisons of parameters allow characterizing the most appropriate configuration of the reef to improve the surfing conditions in the study area. A methodology based on numerical free surface elevations and horizontal velocity components was developed to calculate wave directions, since this is not a direct output of the COULWAVE model. Concerning coastal protection, analyses of the mean currents around the reef were used together with observations of the velocity cells near the shoreline as an indication of the sediment transport.

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Acknowledgments

This project has been supported by the Fundação para a Ciência e a Tecnologia through grant PTDC/ECM/66516/2006 and PTDC/ECM/67411/2006.

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Authors and Affiliations

  1. Laboratório Nacional de Engenharia Civil, Departamento de Hidráulica e Ambiente, Lisbon, Portugal

    Ana Mendonça, Conceição Juana Fortes, Rui Capitão, Maria da Graça Neves & Theo Moura

  2. Departamento de Engenharia Civil, IMAR/FCTUC, 3030-788, Coimbra, Portugal

    José Simão Antunes do Carmo

Authors
  1. Ana Mendonça
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  2. Conceição Juana Fortes
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  3. Rui Capitão
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  4. Maria da Graça Neves
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  5. Theo Moura
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  6. José Simão Antunes do Carmo
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Correspondence to Ana Mendonça.

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Mendonça, A., Fortes, C.J., Capitão, R. et al. Wave hydrodynamics around a multi-functional artificial reef at Leirosa. J Coast Conserv 16, 543–553 (2012). https://doi.org/10.1007/s11852-012-0196-1

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  • DOI: https://doi.org/10.1007/s11852-012-0196-1

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